Diagnostic System Check - Radio/Audio System. Chevrolet PJJ 2000

For 1990-2009 cars

### Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

1. Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.

2. The symptom list in Symptoms will determine the correct diagnostic procedure to use.

3. The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will compile all the available information before tests are performed.

Step | Action | Yes | No
--- | --- | --- | ---
1 | Install a scan tool. Does the scan tool power up? | Go to Step 2 | Go to Scan Tool Does Not Power Up in Data Link Communications

2

1. Turn ON the ignition, with the engine OFF.
2. Attempt to establish communication with the radio.

Does the scan tool communicate with the radio?

Go to Step 3

Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications

3 | Select the radio display DTCs function on the scan tool. Does the scan tool display any DTCs? | Go to Step 4 | Go to Symptoms
4 | Does the scan tool display any DTCs which begin with a "U"? | Go to Scan Tool Does Not Communicate with Class 2 Device in Data Link Communications | Go to Step 5
5 | Does the scan tool display DTC B1000? | Go to DTC B1000 BCM Malfunction in Body Control System | Go to Step 6
6 | Does the scan tool display DTC B1327 or B1328? | Go to Diagnostic Trouble Code (DTC) List/Type in Engine Electrical | Go to Step 7
7 | Does the scan tool display DTC B1001 or DTC B1780? | Go to Diagnostic Trouble Code (DTC) List/Type | Go to Symptoms